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Gene action and heterosis in F1 clonal progenies of cassava for β-Carotene and farmers` preferred traits.
Thursday, 2019/07/18 | 08:36:10

Athanase NRob M.

Heliyon. 2019 Jun 17; 5(6): e01807. doi: 10.1016/j.heliyon.2019.e01807. eCollection 2019 Jun.



Gene action and heterosis provides information to assist breeder for selecting and generating improved plant recombinants. This study aimed at determining the gene action of selected cassava traits. The F1 clones exhibited considerable phenotypic variability between families and offsprings. The best F1 progenies had a higher amount of β-carotene (β-C) of 6.12 mg 100 g-1 against 1.32 mg 100 g-1 of the best parent. This superiority could be attributed to the over-dominance from the recombination of additive gene action and epistasis. The general combining ability (GCA) of parents and specific combining ability (SCA) of combinations were significant for different traits, and indicating the role of additive and non-additive gene action in controlling such traits. The significant GCA for β-C and postharvest physiological deterioration (PPD) indicates the role of additive gene action. The significant SCA for cassava mosaic disease (CMD) and cassava brown streak disease (CBSD) showed a predominance of non-additive gene action. The F1 progenies from the family Mavoka x Garukunsubire expressed the highest positive heterosis for CMD, dry matter and β-C. The high positive heterosis for β-C and DMC could be linked to transgressive segregation, because one of the parents was poor combiner.


See https://www.ncbi.nlm.nih.gov/pubmed/31249885


Figure 1: Developed cassava clones with high carotenoids and delayed PPD.

A: Flowers covered to avoid free cross pollination,

B: new clone with high yield,

C: Deep yellow of cassava pulp,

D and E: Orange and or pink of cassava pulp,

F: Orange fleshed cooked cassava.



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